Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1oZjQzLTQ3cTQtZmhxNc4AA63z

XWiki Commons missing escaping of `{` in Velocity escapetool allows remote code execution

Impact

The HTML escaping of escaping tool that is used in XWiki doesn't escape {, which, when used in certain places, allows XWiki syntax injection and thereby remote code execution.

To reproduce in an XWiki installation, open <xwiki-host>/xwiki/bin/view/Panels/PanelLayoutUpdate?place=%7B%7B%2Fhtml%7D%7D%7B%7Basync%20async%3Dfalse%7D%7D%7B%7Bvelocity%7D%7D%23evaluate(%24request.eval)%7B%7B%2Fvelocity%7D%7D%7B%7B%2Fasync%7D%7D&eval=Hello%20from%20URL%20Parameter!%20I%20got%20programming%3A%20%24services.security.authorization.hasAccess(%27programming%27) where <xwiki-host> is the URL of your XWiki installation. If this displays You are not admin on this place Hello from URL Parameter! I got programming: true, the installation is vulnerable.

Patches

The vulnerability has been fixed on XWiki 14.10.19, 15.5.5, and 15.9 RC1.

Workarounds

Apart from upgrading, there is no generic workaround. However, replacing $escapetool.html by $escapetool.xml in XWiki documents fixes the vulnerability. In a standard XWiki installation, we're only aware of the document Panels.PanelLayoutUpdate that exposes this vulnerability, patching this document is thus a workaround. Any extension could expose this vulnerability and might thus require patching, too.

References

• https://github.com/xwiki/xwiki-commons/commit/b94142e2a66ec32e89eacab67c3da8d91f5ef93a
• https://jira.xwiki.org/browse/XCOMMONS-2828
• https://jira.xwiki.org/browse/XWIKI-21438

Permalink: https://github.com/advisories/GHSA-hf43-47q4-fhq5
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1oZjQzLTQ3cTQtZmhxNc4AA63z
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: 9 months ago
Updated: 5 days ago

CVSS Score: 10.0
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Percentage: 0.00297
EPSS Percentile: 0.69117

Identifiers: GHSA-hf43-47q4-fhq5, CVE-2024-31996
References:

• https://github.com/xwiki/xwiki-commons/security/advisories/GHSA-hf43-47q4-fhq5
• https://github.com/xwiki/xwiki-commons/commit/b0805160ec7b01ee12417e79cb384e60ae4817aa
• https://github.com/xwiki/xwiki-commons/commit/b94142e2a66ec32e89eacab67c3da8d91f5ef93a
• https://github.com/xwiki/xwiki-commons/commit/ed7ff515a2436a1c6dcbd0c6ca0c41e434d58915
• https://jira.xwiki.org/browse/XCOMMONS-2828
• https://jira.xwiki.org/browse/XWIKI-21438
• https://nvd.nist.gov/vuln/detail/CVE-2024-31996
• https://github.com/advisories/GHSA-hf43-47q4-fhq5

Repository: https://github.com/xwiki/xwiki-commons
Blast Radius: 18.1

Affected Packages